| ADI | Academy of Dentistry International; acceptable daily intake; AIDS-defining illness; allowable daily ... |
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| DRF | Daily Rating Form; daily replacement factor; Deafness Research Foundation; dose reduction factor |
| OCP | octacalcium phosphate; ocular cicatricial pemphigoid; oral case presentation; oral contraceptive pil... |
| OET | oral endotracheal tube; oral esophageal tube |
| OHI | Occupational Health Institute; operative hypertension indicator; oral hygiene index; Oral Hygiene In... |
| one-sided | 1. Having one side only, or one side prominent; hence, limited to one side; partial; unjust; unfair; as, a one-sided view or statement. "Unguarded and one-sided language." 2. <botany> Growing on one side of a stem; as, one-sided flowers. One-sid"ed-ly, One-sidedness. Source: Websters Dictionary (01 Mar 1998) |
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| one-step procedure | A procedure in which a surgical biopsy is performed under general anesthesia and if cancer is found, a mastectomy or lumpectomy is done immediately as part of the same operation. (09 Oct 1997) |
| 3a-hydroxy-5a-pregnan-20-one | A catabolite of progesterone; found in the urine of pregnant women. (05 Mar 2000) |
| 7 alpha-hydroxy-4-cholesten-3-one-12 alpha monooxygenase | <enzyme> Liver microsomal enzyme active in conversion of cholesterol to cholic acid; introduces a 12 alpha-hydroxyl group into the steroid nucleus of cholesterol Registry number: EC 1.14.99.- Synonym: 7-hco-monooxygenase, hco 12 alpha-hydroxylase (26 Jun 1999) |
| -one | <chemistry, suffix> A termination indicating that the hydrocarbon to the name of which it is affixed belongs to the fourth series of hydrocarbons, or the third series of unsaturated hydrocarbonsl as, nonone. (29 Oct 1998) |
| conservation of natural resources | The protection, preservation, restoration, and rational use of all resources in the total environment. (12 Dec 1998) |
| natural | 1. Fixed or determined by nature; pertaining to the constitution of a thing; belonging to native character; according to nature; essential; characteristic; not artifical, foreign, assumed, put on, or acquired; as, the natural growth of animals or plants; the natural motion of a gravitating body; natural strength or disposition; the natural heat of the body; natural colour. "With strong natural sense, and rare force of will." (Macaulay) 2. Conformed to the order, laws, or actual facts, of nature; consonant to the methods of nature; according to the stated course of things, or in accordance with the laws which govern events, feelings, etc.; not exceptional or violent; legitimate; normal; regular; as, the natural consequence of crime; a natural death. "What can be more natural than the circumstances in the behavior of those women who had lost their husbands on this fatal day?" (Addison) 3. Having to do with existing system to things; dealing with, or derived from, the creation, or the world of matter and mind, as known by man; within the scope of human reason or experience; not supernatural; as, a natural law; natural science; history, theology. "I call that natural religion which men might know . By the mere principles of reason, improved by consideration and experience, without the help of revelation." (Bp. Wilkins) 4. Conformed to truth or reality; as: Springing from true sentiment; not artifical or exaggerated; said of action, delivery, etc.; as, a natural gesture, tone, etc. Resembling the object imitated; true to nature; according to the life; said of anything copied or imitated; as, a portrait is natural. 5. Having the character or sentiments properly belonging to one's position; not unnatural in feelings. "To leave his wife, to leave his babes, . He wants the natural touch." (Shak) 6. Connected by the ties of consanguinity. "Natural friends." 7. Begotten without the sanction of law; born out of wedlock; illegitimate; bastard; as, a natural child. 8. Of or pertaining to the lower or animal nature, as contrasted with the higher or moral powers, or that which is spiritual; being in a state of nature; unregenerate. "The natural man receiveth not the things of the Spirit of God." (1 Cor. Ii. 14) 9. <mathematics> Belonging to, to be taken in, or referred to, some system, in which the base is 1; said or certain functions or numbers; as, natural numbers, those commencing at 1; natural sines, cosines, etc, those taken in arcs whose radii are 1. 10. Produced by natural organs, as those of the human throat, in distinction from instrumental music. Of or pertaining to a key which has neither a flat nor a sharp for its signature, as the key of C major. Applied to an air or modulation of harmony which moves by easy and smooth transitions, digressing but little from the original key. Natural day, the space of twenty-four hours. Natural fats, Natural gas, etc. See Fat, Gas. Etc. Natural Harmony, a classification based upon real affinities, as shown in the structure of all parts of the organisms, and by their embryology. "It should be borne in mind that the natural system of botany is natural only in the constitution of its genera, tribes, orders, etc, and in its grand divisions." (Gray) Natural theology, or Natural religion, that part of theological science which treats of those evidences of the existence and attributes of the Supreme Being which are exhibited in nature; distinguished from revealed religion. See Quotation under Natural. Natural vowel, the vowel sound heard in urn, furl, sir, her, etc.; so called as being uttered in the easiest open position of the mouth organs. See Neutral vowel. Synonym: See Native. Origin: OE. Naturel, F. Naturel, fr. L. Naturalis, fr. Natura. See Nature. Source: Websters Dictionary (01 Mar 1998) |
| natural antibody | Antibody demonstrable in the serum or plasma of various persons or animals not known to have been stimulated by specific antigen, either artificially or as the result of naturally occurring contact. Synonym: natural antibody. (05 Mar 2000) |
| natural childbirth | Psychophysical relaxation techniques that are used to facilitate childbirth. (12 Dec 1998) |
| natural classification | <zoology> Classification based on inferences concerning the phylogenetic relationships of animals. (09 Jan 1998) |
| natural dentition | See: dentition. (05 Mar 2000) |
| natural disasters | Sudden calamitous events producing great material damage, loss, and distress. They are the result of natural phenomena such as earthquakes, floods, etc. (12 Dec 1998) |
| natural dyes | Dye's obtained from animals or plants; examples include carmine, obtained from cochineal in the dried female insect Dactylopius cacti of Central America, and haematoxylin, extracted from the bark of the logwood tree Haematoxylon campechianum in the Caribbean area. (05 Mar 2000) |
| natural focus of infection | An ecosystem in which an infectious agent normally persists in nature; e.g., yellow fever virus in a jungle monkey-Haemagogus mosquito ecosystem. (05 Mar 2000) |
| natural haemolysin | Haemolysin occurring in the plasma of an animal of one species, e.g., a dog, which fixes complement with the red blood cells of some other species, e.g., a rabbit, thereby causing haemolysis of the cells of the rabbit, although the dog was not previously exposed to antigenic stimulation with such cells. (05 Mar 2000) |